I can't think of any way to do this for category pages. If you're suggesting changes to PHP code, please keep in mind that we don't support such changes to core files. So, I'd recommend making such attempts within the context of Base Theme, keeping your Framework intact.

Keep in mind that if you change core files, with the next update, you're likely to experience the overwrites done in custom coding being wiped out.

Thanks Rob.
Actually, I found a selection in the Framework front-end which allows this. No coding required.
I'd tell you the exact spot but I'm on my iPad now so I don't have access to my local server.
Maybe in the morning.